CA1178146A - Ascension pipe heat shield - Google Patents
Ascension pipe heat shieldInfo
- Publication number
- CA1178146A CA1178146A CA000409452A CA409452A CA1178146A CA 1178146 A CA1178146 A CA 1178146A CA 000409452 A CA000409452 A CA 000409452A CA 409452 A CA409452 A CA 409452A CA 1178146 A CA1178146 A CA 1178146A
- Authority
- CA
- Canada
- Prior art keywords
- pipe
- wall section
- vertical
- combination
- air space
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000003570 air Substances 0.000 claims abstract description 72
- 239000000571 coke Substances 0.000 claims abstract description 19
- 239000012080 ambient air Substances 0.000 claims abstract description 14
- 230000002093 peripheral effect Effects 0.000 claims abstract description 11
- 239000012530 fluid Substances 0.000 claims abstract description 7
- 238000005192 partition Methods 0.000 claims abstract description 6
- 230000000903 blocking effect Effects 0.000 claims abstract 3
- 239000011810 insulating material Substances 0.000 claims description 3
- 244000261422 Lysimachia clethroides Species 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004939 coking Methods 0.000 description 2
- 102000004405 Collectins Human genes 0.000 description 1
- 108090000909 Collectins Proteins 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000009422 external insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B27/00—Arrangements for withdrawal of the distillation gases
- C10B27/06—Conduit details, e.g. valves
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Coke Industry (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The present invention deals with heat shields for use in connection with hot pipes and, in particular, for use with coke oven ascension pipes.
A device for providing enhanced heat shielding on an inward side of a heated vertical pipe projecting from a pipe supporting structure compris-ing:
(a) a generally cylindrical lower wall section spaced from and peripherally enclosing the pipe in generally concentric arrangement so as to form a peripheral lower vertical air space between itself and the pipe;
(b) means for remotely mounting said lower wall section above the pipe supporting structure as to establish lower fluid communication between said lower vertical air space and ambient air;
(c) an arcuate upper wall section aligned with and connected end to end to the cylindrical lower wall section and inwardly displaced from the pipe so as to form an upper vertical air space vertically contiguous with said lower vertical air space;
(d) a lower interior vertical wall section inwardly displaced from the pipe below said arcuate upper wall section so as to partition said peripheral lower vertical air space into a warmer air flow channel peripherally adjacent to the pipe and a cooler air flow channel remote from the pipe; and (e) closure means for outwardly blocking the warmer air flow channel, such that ambient air is drawn upwardly first through said lower vertical air space then through said upper vertical air space and is then upwardly discharged so as to continuously dissipate pipe heat.
The present invention deals with heat shields for use in connection with hot pipes and, in particular, for use with coke oven ascension pipes.
A device for providing enhanced heat shielding on an inward side of a heated vertical pipe projecting from a pipe supporting structure compris-ing:
(a) a generally cylindrical lower wall section spaced from and peripherally enclosing the pipe in generally concentric arrangement so as to form a peripheral lower vertical air space between itself and the pipe;
(b) means for remotely mounting said lower wall section above the pipe supporting structure as to establish lower fluid communication between said lower vertical air space and ambient air;
(c) an arcuate upper wall section aligned with and connected end to end to the cylindrical lower wall section and inwardly displaced from the pipe so as to form an upper vertical air space vertically contiguous with said lower vertical air space;
(d) a lower interior vertical wall section inwardly displaced from the pipe below said arcuate upper wall section so as to partition said peripheral lower vertical air space into a warmer air flow channel peripherally adjacent to the pipe and a cooler air flow channel remote from the pipe; and (e) closure means for outwardly blocking the warmer air flow channel, such that ambient air is drawn upwardly first through said lower vertical air space then through said upper vertical air space and is then upwardly discharged so as to continuously dissipate pipe heat.
Description
F.C. Hetrick & D.T. ~,linter, i)JL/l~e ~ 6 ¦ Ascensi on Pipe Heat Shi el d ¦ Backgroulld of the Tnventlon I lo Field of the Invention I ... ~
!~ The present inven~ion deals with heat shields for use in connection I with hot pipes and, in particular, for use with coke oven ascension pipes.
!~ The present inven~ion deals with heat shields for use in connection I with hot pipes and, in particular, for use with coke oven ascension pipes.
2. i)escription of the Prior Art The need to protect workmen from i~iury due to contact with hot pipes ¦
and discomfort from radiant heat eminatin~ from such pipes is one tha~ is common to a number of industries. Conventionally, such protection is provided by wrapping insulating material around the pipe ur by completely or partially o 1 enclosing the pipe within a spaced peripherdl shield so as to create an insu-lating air space adjacent the pipe. It is found, however, tha~ in certain cases, any such method which has the effect of decreasing heat ~iow from the pipe, itself, may also have the ~ffect af increaslng the pipe's internal I temperdture to an unacceptable level. Furthenmore~ in certain situations, a : I vertica7 pipe may ~e positioned so that one of its sides faces a work area while its other side is adjacent a wall or is otherwise facing some area not frequented by workmen~ In such cases, it may be desirable to provide rela-tively more protection on the side of the pipe facing the work space than on the side with which workmen are not likely to come into contact. The advan tage of being able to position an area of maximum protect10n at a particular circumferential section o~ the pipe might not, however, be readily attaindble when a unifonm insulating layer is used on a pipe.
In the case of coke ovens, for example, a number of workmen are usually assigned to various duties on the battery t~p. Along the sides of the ¦
ba~tery top, coke oven ascension pipes project upwardly to connect ducts Il . I
''' ` _~ I
~7~ 6 in the roof with a collecting main that runs alongside the coke oven. The surface t ~lperat~res of these ascension pipes mdy re~ch 700F, and in order to prutect workers on the battery top from being accidentally burned by contact with these ascension pipes, as well as to decrease the radiant heat fran th~
pipes to which these workers are exposed, it is important that an effective heat shield be provided on the side of the ascension pipe which faces inwardly toward the center of the battery top. The efficiency, on the other hand, of /
any hea~ shield on the side which faces outwardly over the side o~ the coke oven, is probably of less concern since workmen are probably less likely to directly touch or bc e~posed to radian~ hea~ from ~hat side o~ the ascension pipe.
Heat shields heretofore in use on coke oven ascension pipes have, in general, consisted of a single sheet of metal which is remotely connected to the ascension pipe, usually only on its side which faces inwardly toward the oven roof, so as to ~orm an air space between the shield and the ascension pipe. A heat shield of this type is shown, for example, at numeral 14 in the drawings of U.S. Patent No. 4,197,164. While such heat shields are known to pravide some protection, it is found that at times they may reach temperatures which might be considered ~azardous to nearby workmen- In view of these diffi- I
culities associated with ascension pipe heat shields heretofore in use, it has been suggested that aseension pipes be wrapped with a layer of external insu-lation so as to still further lower their externdl ti~nperature. It is, how~
ever, believed that such a layer of insulation would retain heat to an extent so as to cause the internal temperature of the ascension pipes to rise to a point which might be detrimental to the pipe. It is, therefore, the object of the present invention to provide a heat shield which maximizes protection on the inner side o~ the ascension pipes and which, at the same time, dissipates heat so s to prevent pipe damage.
~7131~
/
Summary of the Invention The present invention is a heat shield for hot vertical pipes such as coke oven ascension pipes. The pipe isperipheral-ly enclosed by a lower cylindrical wall section so that a lower vertical air space is formed between the wall and the pipe.
An upper arcuate wall section is connected, end to end, to the lower cylindrical wall section so as to form an upper vertical air space between itself and the ascension pipe. The lower vertical air space is outwardly blocked and inwardly partitioned into two separate vertical air channels. One channel, which is adjacent to the heated pipe, will contain warmer, faster moving air while the other channel, which is remote from the pipe, will contain cooler, slower moving air. Faster moving air and slower moving air from these channels converge in the upper vertical air space so as to establish an upward draft. By means of this draft, cooler exterior air is continuously drawn upward-ly, first into the lower then into the upper vertical air space, until it is evacuated from the top of the upper arcuate wall section so as to dissipate heat from the inward side of the pipe.
More particularly, the invention provides a device for providing enhanced heat shielding on an inward side of a heated vertical pipe projecting from a pipe supporting structure comprising:
(a) a generally cylindrical lower wall section spaced from and peripherally enclosing the pipe in generally concentric arrangement so as to form a peripheral lower vertical air space between itself and the pipe;
(b) means for remotely mounting said lower wall section above the pipe supporting structure as toestablish lower fluid communication between said lower
and discomfort from radiant heat eminatin~ from such pipes is one tha~ is common to a number of industries. Conventionally, such protection is provided by wrapping insulating material around the pipe ur by completely or partially o 1 enclosing the pipe within a spaced peripherdl shield so as to create an insu-lating air space adjacent the pipe. It is found, however, tha~ in certain cases, any such method which has the effect of decreasing heat ~iow from the pipe, itself, may also have the ~ffect af increaslng the pipe's internal I temperdture to an unacceptable level. Furthenmore~ in certain situations, a : I vertica7 pipe may ~e positioned so that one of its sides faces a work area while its other side is adjacent a wall or is otherwise facing some area not frequented by workmen~ In such cases, it may be desirable to provide rela-tively more protection on the side of the pipe facing the work space than on the side with which workmen are not likely to come into contact. The advan tage of being able to position an area of maximum protect10n at a particular circumferential section o~ the pipe might not, however, be readily attaindble when a unifonm insulating layer is used on a pipe.
In the case of coke ovens, for example, a number of workmen are usually assigned to various duties on the battery t~p. Along the sides of the ¦
ba~tery top, coke oven ascension pipes project upwardly to connect ducts Il . I
''' ` _~ I
~7~ 6 in the roof with a collecting main that runs alongside the coke oven. The surface t ~lperat~res of these ascension pipes mdy re~ch 700F, and in order to prutect workers on the battery top from being accidentally burned by contact with these ascension pipes, as well as to decrease the radiant heat fran th~
pipes to which these workers are exposed, it is important that an effective heat shield be provided on the side of the ascension pipe which faces inwardly toward the center of the battery top. The efficiency, on the other hand, of /
any hea~ shield on the side which faces outwardly over the side o~ the coke oven, is probably of less concern since workmen are probably less likely to directly touch or bc e~posed to radian~ hea~ from ~hat side o~ the ascension pipe.
Heat shields heretofore in use on coke oven ascension pipes have, in general, consisted of a single sheet of metal which is remotely connected to the ascension pipe, usually only on its side which faces inwardly toward the oven roof, so as to ~orm an air space between the shield and the ascension pipe. A heat shield of this type is shown, for example, at numeral 14 in the drawings of U.S. Patent No. 4,197,164. While such heat shields are known to pravide some protection, it is found that at times they may reach temperatures which might be considered ~azardous to nearby workmen- In view of these diffi- I
culities associated with ascension pipe heat shields heretofore in use, it has been suggested that aseension pipes be wrapped with a layer of external insu-lation so as to still further lower their externdl ti~nperature. It is, how~
ever, believed that such a layer of insulation would retain heat to an extent so as to cause the internal temperature of the ascension pipes to rise to a point which might be detrimental to the pipe. It is, therefore, the object of the present invention to provide a heat shield which maximizes protection on the inner side o~ the ascension pipes and which, at the same time, dissipates heat so s to prevent pipe damage.
~7131~
/
Summary of the Invention The present invention is a heat shield for hot vertical pipes such as coke oven ascension pipes. The pipe isperipheral-ly enclosed by a lower cylindrical wall section so that a lower vertical air space is formed between the wall and the pipe.
An upper arcuate wall section is connected, end to end, to the lower cylindrical wall section so as to form an upper vertical air space between itself and the ascension pipe. The lower vertical air space is outwardly blocked and inwardly partitioned into two separate vertical air channels. One channel, which is adjacent to the heated pipe, will contain warmer, faster moving air while the other channel, which is remote from the pipe, will contain cooler, slower moving air. Faster moving air and slower moving air from these channels converge in the upper vertical air space so as to establish an upward draft. By means of this draft, cooler exterior air is continuously drawn upward-ly, first into the lower then into the upper vertical air space, until it is evacuated from the top of the upper arcuate wall section so as to dissipate heat from the inward side of the pipe.
More particularly, the invention provides a device for providing enhanced heat shielding on an inward side of a heated vertical pipe projecting from a pipe supporting structure comprising:
(a) a generally cylindrical lower wall section spaced from and peripherally enclosing the pipe in generally concentric arrangement so as to form a peripheral lower vertical air space between itself and the pipe;
(b) means for remotely mounting said lower wall section above the pipe supporting structure as toestablish lower fluid communication between said lower
- 3 -` -~7~L46 vertical air space and ambient air;
(c) an arcuate upper wall section aligned with and connected end to end to the cylindrical lower wall section and inwardly displaced from the pipe so as to form an upper vertical air spaee vertieally eontiguous with said lower vertical air space;
(d) a lower interior vertical wall section inwardly displaeed from the pipe below said areuate upper wall section so as to partition said peripheral lower vertical air space into a warmer air flow channel peripherally adjacent to the pipe and a cooler air flow channel remote from the pipe;
and (e) elosure means for outwardly bloeking the warmer air flow channel, such that ambient air is drawn upwardly first through sai.d lower vertieal air space then through said upper vertical air space and is then upwardly diseharged so as to continu-ously dissipate pipe heat.
In other words, the invention provides a deviee for providing enhanced heat shielding on an inward side of a heated vertieal pipe projecting from a pipe supporting structure com-prising:
(a) a bell-shaped housing open at its lower end and having a central aperture through which the pipe is interiorly received, and having a second aperture inwardly displaced from said central aperture;
(b) means for remotely mounting the bell-shaped hous-30~ ing above the pipe supporting structure so as to establish lower, interior fluid communication with ambient air;
- 3a -- ~L9L78~
(c) a stack member vertically projecting from the bell-shaped housing at said second aperture; and (d) a vertical wall positioned below said stack member so as to interiorly partition the bell-shaped housing into a warmer air flow channel adjacent the ascension pipe and a cooler air flow channel remote from the vertical pipe, such that ambient air is drawn upwardly first through the bell-shaped,housing and then through the stack member and is then upwardly discharged so as to continuously dissipate ascension pipe heat.
Brief D'e:s'c'r'ipti'on of'the Drawinq The present invention is further described in the accompan,ving drawings in which:
Figure 1 is a front elevation~a]. view of the heat shield of the present invention mounted on a c:oke oven ascension pipei Figure 2 is a cut-away view of the heat shield of the ' present invention similar to that shown in Figure l;
Figure 3 is an enlarged plan view of the heat shield illustrated in Figure l; and Figure 4 is an enlarged cross-sectional view of the heat shield of the present invention as taken through line IV-IV in Figure 1.
- 3b -~'Y~ L6 The heat shield of the present invention is shown as mounted on a coke oven ascension pipe in Figures 1 and 2. The coke oven is shown in fra~J-ment dt nUmerdl 10. The ascension pipe 12 projects vertically from a duct located on the roof and near the si~e of the battery top. The ascension pipe is connected at its upper end at flange 14 to gooseneck pipe 16. This gooseneck is equipped ~with a lid 18 which opens to facilitate the interior cleaning of the gooseneck and the ascension pipe. The gooseneck is also closeably connected at its terminal end to a collectin~ main 20. Da~per pan 22 provides the means for closing and opening the gooseneck. The collecting main is mounted by supports such as leg 24 on platform 26, and this platform is, in turn, mounted on the buckstays as at 28. By means of the above described arrangement, volatile products oF the coking process are conveyed from the coke oven through the ascension and the gooseneck pipes and to the collecting main. At various stages of the coking process, the ascension pipe will reach temperatures of approximately 700F, and since workmen are typically required to be on the coke oven roof ~o perfonn various ~asks when the ~scension pipes are so heated it is necessary that an e~fective heat shield be provided to protect these workers from heat eminating from the pipes. It will also be noted that most of the duties perfonmed by these workers will require them tu be positioned between the ascension pipes and the !center of the battery top, or, in other words, on the side of the ascension pipe opposite fron the collecting main. Because personnel Frequent this inward side of the ascension pipe, it will be apparent to those familiar with coke oven operations that the optimiza~ion of heat shielding on this side of the ascension pipe would be a desirable result.
Still referring to Figures 1 and 2, the heat shield of the present invention is shown generally at numeral 30. The heat shield 30 includes a lower generally cylindrical wall section, shown generally at 32, which is mad~
.', ~L78~
up of two separate metal plates, namely an outward lower semicylindrical section 34 and an inward lower semicylindrical section 36. The lower cylin- !
drical wall section 32 is remotely supported on the roof of coke oven by a plurality of legs as at 38~ Another major part of the heat shield 30 is the upper semicylindrical wall section 40 which is connecte~, end to end~ to the lower cylindrical wall section. For ease of maintenance, the upper semicylin drical wall section 40 may be broken down into an upper section 42 and a medial section 44. The medial section 44 is connected to the in~lard lo~er semicylindrical séction 36 at flange 46 and is connected to the upper section 42 at flange 48. The heat shield is also characterized by slots S0 and 52 which receive portions of ~he ascension pipe lid linkage shown generally at numeral 54. This linkage opens and closes the ascension pipe lid 18 and includes operdting lever 56 which rota~es in a vertical arc on pin 58 so dS to ¦Ye d trunion 60 from the position illus~.rated to one where the lid 18 is open and the trunion 60 is in engagement ~Ath slot 50. Figures 1 and 2 dlso show that slot 52 receives an operating lid step plate 62 which projects from operating lever 5~ and which moves out of engagement with 62 when the operat-ing lever is moYed downwardly to open the lid 18. It will also be obserYed that the medial section 44 is fixed to the ascension pipe by means of brackets 64 and 66 and two other brackets (not shown) which are positioned on the opposite side of the ascension pipe.
Re~erring particularly to Figure 2, it will be seen that a lower peripheral vertical air space, shown generally at 68, is ~ormed between the ascension pipe 12 and the lower cylindrical wall section 32. Between the ascension pipe 12 and the upper semicylindrical wall section 40, there is also an upper inward vertical air space 70. From Figures 2 and 4, it will be seen that a semicylindrical interior wall 72 is attached at its lateral edges to the interior side of the outward lower semi-cylindrical section 34 and is retained thereto by means of bolts 74 and 76. This interior wall partitions _ 5 ll I', _ l_ ;
117~3146 the lower peripheral vertical air space into a w~nmer air channel 78, which is ¦
peripherally adjacent the ascension pipe 12, and a re~ote cooler air channel 80, which is formed between the interior wall 72 and the inward lower semi-cylindrical section 36. The lower cylindrical wall section 32 is also charac-terized by an outward closure plate 82 which projects toward the ascension pipe from the upper edge o~ the outward lower semicylindrical section 34. The effect of the closure plate 82 appears to be to cause air to flow from the outward portion of the warmer air channel 78, which underlies the outward lower semicylindrical section7 into the inward position of the warmer air channel, which underlies the inward lower semicylindrical section 36, so as to ¦increase the velocity of the fluid flow in that inward section. In any case, it has been found that the convergence of air from the warmer air channel 78 and the cooler air channel 80, above the interior wall 78, results in the establishment of an upwardly directed draf1t in both the lower peripheral vertical air space 68 and the upper inward vertical air space 70. Thus, rela- ,tivély cool ambient air is continuously dr,awn first into the lower peripheral vertical air space 68 and then into the upper vertical air space 70 and finally is discharged at the top of the upper semicylindr~cal wall system.
Heat is absorbed by this air on the inward surface of the ascension pipe and iS dissipated from the top of the heat shield.
From Figures 2 and 3 it w~ll be seen that additional protection frorn the hot ascension pipe is provided by means of an upper insulating layer 84 which is interiorly attached to the upper section 42 of the upper semi-cylindrical wall section 40. Figure 2 shows that a similar medial insulating layer 86 is also attached to the medial section 44 of upper semicylindrical wall section 40, and Figures 2 and 4 shows a lower insulation layer 88 which is interiorly attached on the inner side of the lower cylindrical wall section '32. Finally, it will be observed from Figure 3 that the upper section 42 ha~
at its lateral ed~es, two interiorly oriented flanges 90 and 92 which abut ~h~
li78146 gooseneck above and below flange 14 so as to better channPlize the upward flow of air in ~he upper reaches of the upper vertical air space.
While not illustrated in the drawings, it may be possible to improve the performance of the heat shield o~ the present invention by providing a blower or other equivalent means for incre~sing the velocity o~ the upward air flow between the heat shield and the ascension pipe. While also not shown, it may also, under certain circumstances, be desirable to provide an exterior layer of insulation or an air enclosing sheet o~ metal on the unshielded outer ¦side of the ascension pipe above the outward lower semicylindrical section 34.
It will thus be seen that there is provided an effectiY2 heat shield which is particularly useful for providing nlaximum protection over that part of an ascension pipe's periphery which presents the greatest danger to nearby workmen. Furthermore, it is believed th,at the surprising and unexpecte~
occurrence of a stack effect between the heat shield of the presen~ invention and the ascension pipe is responsible for a substantial reduction in measured temperatures on the exterior of the heat shield as compared with those which hdYe been measured on the above described single-plate ty~e heat shields heretofore used on ascension pipes. Thcse skilled in the art, however, will recognize that ~t will be possible to ~ary, to some extent, the configuration f the component wall sections of the heat shield described above and still ob~ain such a stack effect. It would, for example~ be possible to substitute a wide variety of equivalent partitioned, bell-shaped housings fo~ the lower cylindrical wall section described above~ Such a housing would have an open lower end and be spaced from the structure on which it is mounted to allow entrance of ambient air to its interior. This equivalent housing would also have an upper central aperture to accommodate the heated ascension pipe, as well as a second inwardly adjacent aperture khich ~ould allow fluid cam-munication between the interior of the housing 2nd an upwardly projecting stack structure. This stack structure would convey upwardly moving air ov~,~
_ 7 `
an inward portion of the surface of the ascension pipe so as to remove heat fr~n that surface. This cooled surface of the ascension pipe, itself, might, but would not necessarily, form a vertical surface of the stack.
¦ Although the heat shield of ~he present invention has been described ¦ above in connection with a coke oven ascension pipe, it will be understood that it may be employed on any heated vertical or approximately vertical pipe. Accordingly, the present invention will be considered to encompass any ! such use of this heat shield. Furthermore, it is again noted that this heat ¦ shield is of particular usefulness where it-is desired to maximize protection o ¦ on one peripheral section or side of a heated vertical pipe. It is believed ¦ that in most applications of the present invention, that side of a hPated vertical pipe which faces inwardly with respect to some larger room or other orienting structure will~ as is the case with a coke over ascension pipe, be the side of the pipe on which heat shielding is desirably mdximized. While it is recognized that such orientation may not always exist with respec~ to all pipes on which this heat shield may potentially be employed, the use, hereafter, of the tenms "inner" and "inward" will, nevertheless, be understood to refer to that side of a pipe on which efficient heat shielding is of par-ticular desirability or necessity~
Although the invention has been described with a certain degree of particularity, it is to be understood that the present disclosure has been made only as an example and that the scope of the inventian is defined by what ¦ ~s hereifte clalmed.
(c) an arcuate upper wall section aligned with and connected end to end to the cylindrical lower wall section and inwardly displaced from the pipe so as to form an upper vertical air spaee vertieally eontiguous with said lower vertical air space;
(d) a lower interior vertical wall section inwardly displaeed from the pipe below said areuate upper wall section so as to partition said peripheral lower vertical air space into a warmer air flow channel peripherally adjacent to the pipe and a cooler air flow channel remote from the pipe;
and (e) elosure means for outwardly bloeking the warmer air flow channel, such that ambient air is drawn upwardly first through sai.d lower vertieal air space then through said upper vertical air space and is then upwardly diseharged so as to continu-ously dissipate pipe heat.
In other words, the invention provides a deviee for providing enhanced heat shielding on an inward side of a heated vertieal pipe projecting from a pipe supporting structure com-prising:
(a) a bell-shaped housing open at its lower end and having a central aperture through which the pipe is interiorly received, and having a second aperture inwardly displaced from said central aperture;
(b) means for remotely mounting the bell-shaped hous-30~ ing above the pipe supporting structure so as to establish lower, interior fluid communication with ambient air;
- 3a -- ~L9L78~
(c) a stack member vertically projecting from the bell-shaped housing at said second aperture; and (d) a vertical wall positioned below said stack member so as to interiorly partition the bell-shaped housing into a warmer air flow channel adjacent the ascension pipe and a cooler air flow channel remote from the vertical pipe, such that ambient air is drawn upwardly first through the bell-shaped,housing and then through the stack member and is then upwardly discharged so as to continuously dissipate ascension pipe heat.
Brief D'e:s'c'r'ipti'on of'the Drawinq The present invention is further described in the accompan,ving drawings in which:
Figure 1 is a front elevation~a]. view of the heat shield of the present invention mounted on a c:oke oven ascension pipei Figure 2 is a cut-away view of the heat shield of the ' present invention similar to that shown in Figure l;
Figure 3 is an enlarged plan view of the heat shield illustrated in Figure l; and Figure 4 is an enlarged cross-sectional view of the heat shield of the present invention as taken through line IV-IV in Figure 1.
- 3b -~'Y~ L6 The heat shield of the present invention is shown as mounted on a coke oven ascension pipe in Figures 1 and 2. The coke oven is shown in fra~J-ment dt nUmerdl 10. The ascension pipe 12 projects vertically from a duct located on the roof and near the si~e of the battery top. The ascension pipe is connected at its upper end at flange 14 to gooseneck pipe 16. This gooseneck is equipped ~with a lid 18 which opens to facilitate the interior cleaning of the gooseneck and the ascension pipe. The gooseneck is also closeably connected at its terminal end to a collectin~ main 20. Da~per pan 22 provides the means for closing and opening the gooseneck. The collecting main is mounted by supports such as leg 24 on platform 26, and this platform is, in turn, mounted on the buckstays as at 28. By means of the above described arrangement, volatile products oF the coking process are conveyed from the coke oven through the ascension and the gooseneck pipes and to the collecting main. At various stages of the coking process, the ascension pipe will reach temperatures of approximately 700F, and since workmen are typically required to be on the coke oven roof ~o perfonn various ~asks when the ~scension pipes are so heated it is necessary that an e~fective heat shield be provided to protect these workers from heat eminating from the pipes. It will also be noted that most of the duties perfonmed by these workers will require them tu be positioned between the ascension pipes and the !center of the battery top, or, in other words, on the side of the ascension pipe opposite fron the collecting main. Because personnel Frequent this inward side of the ascension pipe, it will be apparent to those familiar with coke oven operations that the optimiza~ion of heat shielding on this side of the ascension pipe would be a desirable result.
Still referring to Figures 1 and 2, the heat shield of the present invention is shown generally at numeral 30. The heat shield 30 includes a lower generally cylindrical wall section, shown generally at 32, which is mad~
.', ~L78~
up of two separate metal plates, namely an outward lower semicylindrical section 34 and an inward lower semicylindrical section 36. The lower cylin- !
drical wall section 32 is remotely supported on the roof of coke oven by a plurality of legs as at 38~ Another major part of the heat shield 30 is the upper semicylindrical wall section 40 which is connecte~, end to end~ to the lower cylindrical wall section. For ease of maintenance, the upper semicylin drical wall section 40 may be broken down into an upper section 42 and a medial section 44. The medial section 44 is connected to the in~lard lo~er semicylindrical séction 36 at flange 46 and is connected to the upper section 42 at flange 48. The heat shield is also characterized by slots S0 and 52 which receive portions of ~he ascension pipe lid linkage shown generally at numeral 54. This linkage opens and closes the ascension pipe lid 18 and includes operdting lever 56 which rota~es in a vertical arc on pin 58 so dS to ¦Ye d trunion 60 from the position illus~.rated to one where the lid 18 is open and the trunion 60 is in engagement ~Ath slot 50. Figures 1 and 2 dlso show that slot 52 receives an operating lid step plate 62 which projects from operating lever 5~ and which moves out of engagement with 62 when the operat-ing lever is moYed downwardly to open the lid 18. It will also be obserYed that the medial section 44 is fixed to the ascension pipe by means of brackets 64 and 66 and two other brackets (not shown) which are positioned on the opposite side of the ascension pipe.
Re~erring particularly to Figure 2, it will be seen that a lower peripheral vertical air space, shown generally at 68, is ~ormed between the ascension pipe 12 and the lower cylindrical wall section 32. Between the ascension pipe 12 and the upper semicylindrical wall section 40, there is also an upper inward vertical air space 70. From Figures 2 and 4, it will be seen that a semicylindrical interior wall 72 is attached at its lateral edges to the interior side of the outward lower semi-cylindrical section 34 and is retained thereto by means of bolts 74 and 76. This interior wall partitions _ 5 ll I', _ l_ ;
117~3146 the lower peripheral vertical air space into a w~nmer air channel 78, which is ¦
peripherally adjacent the ascension pipe 12, and a re~ote cooler air channel 80, which is formed between the interior wall 72 and the inward lower semi-cylindrical section 36. The lower cylindrical wall section 32 is also charac-terized by an outward closure plate 82 which projects toward the ascension pipe from the upper edge o~ the outward lower semicylindrical section 34. The effect of the closure plate 82 appears to be to cause air to flow from the outward portion of the warmer air channel 78, which underlies the outward lower semicylindrical section7 into the inward position of the warmer air channel, which underlies the inward lower semicylindrical section 36, so as to ¦increase the velocity of the fluid flow in that inward section. In any case, it has been found that the convergence of air from the warmer air channel 78 and the cooler air channel 80, above the interior wall 78, results in the establishment of an upwardly directed draf1t in both the lower peripheral vertical air space 68 and the upper inward vertical air space 70. Thus, rela- ,tivély cool ambient air is continuously dr,awn first into the lower peripheral vertical air space 68 and then into the upper vertical air space 70 and finally is discharged at the top of the upper semicylindr~cal wall system.
Heat is absorbed by this air on the inward surface of the ascension pipe and iS dissipated from the top of the heat shield.
From Figures 2 and 3 it w~ll be seen that additional protection frorn the hot ascension pipe is provided by means of an upper insulating layer 84 which is interiorly attached to the upper section 42 of the upper semi-cylindrical wall section 40. Figure 2 shows that a similar medial insulating layer 86 is also attached to the medial section 44 of upper semicylindrical wall section 40, and Figures 2 and 4 shows a lower insulation layer 88 which is interiorly attached on the inner side of the lower cylindrical wall section '32. Finally, it will be observed from Figure 3 that the upper section 42 ha~
at its lateral ed~es, two interiorly oriented flanges 90 and 92 which abut ~h~
li78146 gooseneck above and below flange 14 so as to better channPlize the upward flow of air in ~he upper reaches of the upper vertical air space.
While not illustrated in the drawings, it may be possible to improve the performance of the heat shield o~ the present invention by providing a blower or other equivalent means for incre~sing the velocity o~ the upward air flow between the heat shield and the ascension pipe. While also not shown, it may also, under certain circumstances, be desirable to provide an exterior layer of insulation or an air enclosing sheet o~ metal on the unshielded outer ¦side of the ascension pipe above the outward lower semicylindrical section 34.
It will thus be seen that there is provided an effectiY2 heat shield which is particularly useful for providing nlaximum protection over that part of an ascension pipe's periphery which presents the greatest danger to nearby workmen. Furthermore, it is believed th,at the surprising and unexpecte~
occurrence of a stack effect between the heat shield of the presen~ invention and the ascension pipe is responsible for a substantial reduction in measured temperatures on the exterior of the heat shield as compared with those which hdYe been measured on the above described single-plate ty~e heat shields heretofore used on ascension pipes. Thcse skilled in the art, however, will recognize that ~t will be possible to ~ary, to some extent, the configuration f the component wall sections of the heat shield described above and still ob~ain such a stack effect. It would, for example~ be possible to substitute a wide variety of equivalent partitioned, bell-shaped housings fo~ the lower cylindrical wall section described above~ Such a housing would have an open lower end and be spaced from the structure on which it is mounted to allow entrance of ambient air to its interior. This equivalent housing would also have an upper central aperture to accommodate the heated ascension pipe, as well as a second inwardly adjacent aperture khich ~ould allow fluid cam-munication between the interior of the housing 2nd an upwardly projecting stack structure. This stack structure would convey upwardly moving air ov~,~
_ 7 `
an inward portion of the surface of the ascension pipe so as to remove heat fr~n that surface. This cooled surface of the ascension pipe, itself, might, but would not necessarily, form a vertical surface of the stack.
¦ Although the heat shield of ~he present invention has been described ¦ above in connection with a coke oven ascension pipe, it will be understood that it may be employed on any heated vertical or approximately vertical pipe. Accordingly, the present invention will be considered to encompass any ! such use of this heat shield. Furthermore, it is again noted that this heat ¦ shield is of particular usefulness where it-is desired to maximize protection o ¦ on one peripheral section or side of a heated vertical pipe. It is believed ¦ that in most applications of the present invention, that side of a hPated vertical pipe which faces inwardly with respect to some larger room or other orienting structure will~ as is the case with a coke over ascension pipe, be the side of the pipe on which heat shielding is desirably mdximized. While it is recognized that such orientation may not always exist with respec~ to all pipes on which this heat shield may potentially be employed, the use, hereafter, of the tenms "inner" and "inward" will, nevertheless, be understood to refer to that side of a pipe on which efficient heat shielding is of par-ticular desirability or necessity~
Although the invention has been described with a certain degree of particularity, it is to be understood that the present disclosure has been made only as an example and that the scope of the inventian is defined by what ¦ ~s hereifte clalmed.
Claims (21)
IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In combination, a heated vertical pipe and a device for providing enhanced heat shielding on an inward side of the heated vertical pipe which projects from a pipe supporting structure comprising:
(a) a generally cylindrical lower wall section spaced from and peripherally enclosing the pipe in generally concentric arrangement so as to form a peripheral lower vertical air space between itself and the pipe;
(b) means for remotely mounting said lower wall section above the pipe supporting structure as to establish lower fluid communication between said lower vertical air space and ambient air;
(c) an arcuate upper wall section aligned with and connected end to end to the cylindrical lower wall section and inwardly displaced from the pipe so as to form an upper vertical air space vertically contiguous with said lower vertical air space;
(d) a lower interior vertical wall section inwardly displaced from the pipe below said arcuate upper wall section so as to partition said peripheral lower vertical air space into a warmer air flow channel peripherally adjacent to the pipe and a cooler air flow channel remote from the pipe; and (e) closure means for outwardly blocking the warmer air flow channel, such that ambient air is drawn upwardly first through said lower vertical air space then through said upper vertical air space and is then upwardly discharged so as to continuously dissipate pipe heat.
(a) a generally cylindrical lower wall section spaced from and peripherally enclosing the pipe in generally concentric arrangement so as to form a peripheral lower vertical air space between itself and the pipe;
(b) means for remotely mounting said lower wall section above the pipe supporting structure as to establish lower fluid communication between said lower vertical air space and ambient air;
(c) an arcuate upper wall section aligned with and connected end to end to the cylindrical lower wall section and inwardly displaced from the pipe so as to form an upper vertical air space vertically contiguous with said lower vertical air space;
(d) a lower interior vertical wall section inwardly displaced from the pipe below said arcuate upper wall section so as to partition said peripheral lower vertical air space into a warmer air flow channel peripherally adjacent to the pipe and a cooler air flow channel remote from the pipe; and (e) closure means for outwardly blocking the warmer air flow channel, such that ambient air is drawn upwardly first through said lower vertical air space then through said upper vertical air space and is then upwardly discharged so as to continuously dissipate pipe heat.
2. The combination as defined in claim 1 wherein the lower wall section is comprised of inward and outward generally semicylindrical sections connected at their lateral edges.
3. The combination as defined in claim 2 wherein the outward generally semi-cylindrical section is at its upper edge flared upwardly and inwardly, and wherein the closure means for outwardly blocking the warmer air flow channel is a plate laterally projecting from said upper edge toward the pipe.
4. The combination as defined in claim 1 wherein the lower wall section is positioned relative to the pipe so that more than half of the lower vertical air space is adjacent the Inward side of the pipe.
5. The combination as defined in claim 1 wherein the interior wall section is a vertical arcuate plate connected at its lateral edges to the lower wall section.
6. The combination as defined in claim 1 wherein the means for remotely mounting the lower wall section on the pipe supporting structure consists of a plurality of vertical legs downwardly depending from the lower wall section.
7. The combination as defined in claim 6 wherein the legs are adjustable in height so as to vary ambient air intake.
8. The combination as defined in claim 1 wherein the arcuate upper wall section is semicylindrical.
9. The combination as defined in claim 8 wherein flanges interiorly depend from the lateral edges of the arcuate upper wall section so as to abut the pipe.
10. The combination as defined in claim 8 wherein the upper arcuate wall section is comprised of two separate axially aligned arcuate wall sections connected end to end.
11. The combination as defined in claim 1 wherein a layer of insulating material is attached to the arcuate upper wall section and to the inward side of the generally cylindrical lower wall section.
12. The combination as defined in claim 1 wherein the heated vertical pipe is a coke oven ascension pipe.
13. The combination as defined in claim 12 wherein the coke oven ascension pipe is equipped with an ascension pipe lid and lifting linkage therefor an operating lever having a stop plate and rotating on a pin and a trunion interposed between two arms, one of which is connected to said pin, so that said trunion is moved inwardly in a vertical arc when said operating lever is moved downwardly in a vertical arc to lift said lid, and wherein an inwardly and a downwardly extending slot is provided in the arcuate upper wall section to receive said trunion and adjoining vertical slots are provided in the arcuate upper wall section and the lower wall section to receive said stop plate.
14. The combination as defined in claim 1 wherein the arcuate upper wall section is fixed to the pipe at its lateral edges by means of a plurality of brackets.
15. In combination, a heated vertical pipe and a device for providing enhanced heat shielding on an inward side of the heated vertical pipe which projects from a pipe supporting structure comprising:
(a) a bell-shaped housing open at its lower end and having a central aperture through which the pipe is interiorly received whereby the pipe and housing sealingly contact each other at least on the outward side of the central aperture, and having a second aperture inwardly displaced from said central aperture;
(b) means for remotely mounting the bell-shaped housing above the pipe supporting structure so as to establish lower, interior fluid communication with ambient air;
(c) a stack member vertically projecting from the bell-shaped housing at said second aperture; and (d) a vertical wall positioned below said stack member so as to interiorly partition the bell-shaped housing into a warmer air flow channel adjacent the pipe and a cooler air flow channel remote from the vertical pipe, such that ambient air is drawn upwardly first through the bell-shaped housing and then through the stack member and is then upwardly discharged so as to continuously dissipate pipe heat.
(a) a bell-shaped housing open at its lower end and having a central aperture through which the pipe is interiorly received whereby the pipe and housing sealingly contact each other at least on the outward side of the central aperture, and having a second aperture inwardly displaced from said central aperture;
(b) means for remotely mounting the bell-shaped housing above the pipe supporting structure so as to establish lower, interior fluid communication with ambient air;
(c) a stack member vertically projecting from the bell-shaped housing at said second aperture; and (d) a vertical wall positioned below said stack member so as to interiorly partition the bell-shaped housing into a warmer air flow channel adjacent the pipe and a cooler air flow channel remote from the vertical pipe, such that ambient air is drawn upwardly first through the bell-shaped housing and then through the stack member and is then upwardly discharged so as to continuously dissipate pipe heat.
16. The combination as defined in claim 1 or 15 wherein a blower is provided to increase upward air flow velocity.
17. The combination as defined in claim 1 or 15 wherein a layer of insulating material is outwardly attached to the pipe to protect unshielded areas thereof.
18. The combination as defined in claim 15 wherein the means for remotely mounting the bell-shaped housing above the pipe supporting structure is a plurality of legs downwardly depending from the bell-shaped housing.
19. The combination as defined in claim 18 wherein the legs are adjustable in height so as to vary ambient air intake.
20. The combination as defined in claim 15 wherein the warmer air flow channel is peripherally adjacent the vertical pipe.
21. The combination as defined in claim 15 wherein the pipe is a coke oven ascension pipe.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/315,066 US4373998A (en) | 1981-10-26 | 1981-10-26 | Ascension pipe heat shield |
| US315,066 | 1981-10-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1178146A true CA1178146A (en) | 1984-11-20 |
Family
ID=23222736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000409452A Expired CA1178146A (en) | 1981-10-26 | 1982-08-13 | Ascension pipe heat shield |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US4373998A (en) |
| CA (1) | CA1178146A (en) |
| GB (1) | GB2109523B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4936260A (en) * | 1989-01-17 | 1990-06-26 | Pvi Industries, Inc. | Boiler or water heater with insulated water tank |
| US5791379A (en) * | 1997-05-23 | 1998-08-11 | Piorkowski; Michael J. | Pipe cage |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US152994A (en) * | 1874-07-14 | Improvement in combined ventilators and chimneys | ||
| CH121056A (en) * | 1926-07-19 | 1927-08-16 | Renggli Alois | Device on a heating device having a vertical pipe for the flue gas duct to increase the air heating. |
| US3087408A (en) * | 1960-10-24 | 1963-04-30 | Dura Vent Corp | Factory-built chimney |
| US3294158A (en) * | 1963-12-30 | 1966-12-27 | Anton F Baljet | Baseboard heater |
| US3425733A (en) * | 1965-12-28 | 1969-02-04 | United States Steel Corp | Device for plugging a passageway |
| US3580815A (en) * | 1969-01-30 | 1971-05-25 | Koppers Co Inc | Apparatus for simultaneously actuating standpipe lid,damper valve and steam valve |
| SU380685A1 (en) * | 1971-11-22 | 1973-05-15 | Государственное конструкторское бюро коксохимического машиностроени Государственного всесоюзного института проектированию коксохимической промышленности | DEVICE FOR DISCHARGING GAS FROM COKE OVEN |
| US3804721A (en) * | 1971-12-27 | 1974-04-16 | Koppers Co Inc | Divided collecting main for coke oven |
| DE2230087B2 (en) * | 1972-06-21 | 1976-10-07 | DEVICE FOR OPERATING THE MOUNTING PIPE OF A COOKING OVEN AND THE VALVE FLAP | |
| GB1430146A (en) * | 1973-05-04 | 1976-03-31 | Shell Int Research | Process and apparatus for the disposal of halogenated organic materials |
| DE2730221A1 (en) * | 1977-07-05 | 1979-01-25 | Otto & Co Gmbh Dr C | FURNITURE AT COCING OVENS |
| US4329976A (en) * | 1980-04-08 | 1982-05-18 | Jackson J D | Stove with draft air cooling of rear, opposite side and flue pipe |
| US4346660A (en) * | 1980-10-08 | 1982-08-31 | Mcgill Incorporated | Self-supporting incinerator and expandable shield therefor |
-
1981
- 1981-10-26 US US06/315,066 patent/US4373998A/en not_active Expired - Fee Related
-
1982
- 1982-08-13 CA CA000409452A patent/CA1178146A/en not_active Expired
- 1982-10-22 GB GB08230286A patent/GB2109523B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US4373998A (en) | 1983-02-15 |
| GB2109523A (en) | 1983-06-02 |
| GB2109523B (en) | 1984-11-07 |
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